1175040domain: NAppears in sequencesa(n) = (32/2)*(n-1)*(n-2)*(n-3)*(n-4).at n=18A134175a(n) = n*(n+2)*(n+4)*(n+6).at n=29A190577Number of 2 X 2 nonsingular matrices having all terms in {-n,...,0,...,n}.at n=15A211149Number of 2-color vertex orderings of the labeled cycle graph on 2*n vertices.at n=4A360517